At least now I know to be more aware of security and not just go willy nilly with installing new wallets.
Regardless, I would definitely use a VM and make sure the network won't be compromised.
Thats for sure a very good thing to use a VM when you install a Wallet
It's always a good idea to sandbox your wallets and mining software.
With Linux seperate users works well as long as you never run anything as root.
Download only from reliable sources, preferably directly from the developer.
Open source code is also a bonus for transparency. Wallets provided by the developers are usually open and give you the keys.
If not the coin is probably a scam and should be avoided
Web wallets offer convenience but often keep the keys. Remember: not your keys, not your wallet!